1autumn; fall — one of the four seasons, between summer and winter, characterized by cooler weather and falling leaves.
秋になるとコートが必要になる。
You need a coat when autumn comes.
この果物は秋が旬だ。
This fruit is in season in autumn.
日本の秋は紅葉が美しく、多くの観光客が訪れる。
Autumn in Japan has beautiful colored leaves, and many tourists visit.
秋は「食欲の秋」と呼ばれるほど、食べ物がおいしい季節だ。
Autumn is such a delicious season that it's called "the autumn of appetite."